What do you play against Black's various first moves?

The list:

e5

d5

c5

c6

e6

g6

b6

Nf6

d6

f5

This is nice,I like the name too.

In short, I play Kosten's system pretty exclusively

Yea I'm a big kosten guy myself, although against the king's indian I transpose into the mainline fiancetto system. I played kosten's suggestions in tournaments for a long time and my results were "ok" by not great. Since switching to the mainline KID I've had much better results. I dont think white gets much of anything in the KID unless he plays d4.

I think doing some reading on the KID would be good for me.  I've heard similar things from other people, but I haven't done any homework.

Books on the fiancetto king's indian are hard to find as its not one of the more popular systems. The best single instructional book on the variation is "the fiancetto king's indian" by Colin McNab. It's very good but theoretically out of date. A very recent, up to date, theoretical (but not instructional) look at the variation is "King's Indian and Grunfeld: Fiancetto Lines" by Lasha Janjgava.

http://www.amazon.com/Fianchetto-Kings-Indian-Colin-McNab/dp/1879479400

http://www.amazon.com/Kings-Indian-Grunfeld-Fianchetto-Lines/dp/1901983749

Oh and for you Kosten guys I would also recommend buying a seperate book on the catalan. Kosten's coverage is VERY scant and the catalan is a very theoretical opening. I personally picked "Winning with the Catalan" by Angus Dunnington but there are a couple of good books on it.

thanks for the info, ericmittens.  I've ended up in the Catalan a few times without knowing it until I put my game through chess.com's analysis.  I could use more information for sure.